ESTRO 2024 - Abstract Book

S4348

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Computation times for the IBSWO (including the segment dose calculation, the MLC shape adaptation to the new target position, the solution of the optimization problem, as well as the generation of the new shapes) took on average 2.8s per beam (range 0.64s to 5.10s). 99.3% of the processing time was used by the segment dose calculation which took on average 697ms per segment.

Conclusion:

An accurate estimate of the delivered dose to target and OAR structures opens the opportunity for online adaptation. While the degrees of freedom for the IBSWO are relatively low, this comparatively simple optimization strategy results in a delivered dose to the target that is closer to what was originally planned.

Keywords: MR-guidance, online adaptive radiotherapy

2470

Digital Poster

Proton therapy lateral margin guidelines for ocular tumours

Daniel Björkman 1,2 , Riccardo Via 1 , Maria De Prado 1 , Antony Lomax 1,2 , Guido Baroni 3 , DC Weber 1,4 , Jan Hrbacek 1

1 Paul Scherrer Institute, Centre for Proton Therapy, Villigen, Switzerland. 2 ETH Zurich, Department of Physics, Zurich, Switzerland. 3 Politecnico di Milano, Department of Electronics Information and Bioengineering, Milano, Italy. 4 Inselspital, Bern University Hospital, University of Bern, Department of Radiation Oncology, Bern, Switzerland

Purpose/Objective: